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Wideband Optical Detector of Ultrasound for Medical Imaging Applications
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Air-coupled ultrasound detection using capillary-based optical ring resonators.

Kyu Hyun Kim1,2, Wei Luo2,3, Cheng Zhang2

  • 1Department of Biomedical Engineering, University of Michigan, 1101 Beal Ave., Ann Arbor, MI, 48109, USA.

Scientific Reports
|March 3, 2017
PubMed
Summary

High Q-factor optical ring resonators enable sensitive, non-contact detection of air-coupled ultrasound. This technology advances applications like non-destructive testing and photoacoustic imaging with improved bandwidth and sensitivity.

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Area of Science:

  • Optics
  • Acoustics
  • Materials Science

Background:

  • Optical ring resonators offer high sensitivity for various sensing applications.
  • Non-contact detection of ultrasound in air presents significant challenges.
  • Existing methods often lack the required sensitivity or bandwidth for specific applications.

Purpose of the Study:

  • To experimentally demonstrate and theoretically analyze capillary-based optical ring resonators for air-coupled ultrasound detection.
  • To achieve high Q-factor resonators for enhanced sensitivity.
  • To investigate the interaction between acoustic pulses and resonator mechanical modes.

Main Methods:

  • Fabrication and characterization of capillary-based optical ring resonators with high Q-factor (~10^7).
  • Experimental setup for non-contact detection of air-coupled ultrasound.
  • Theoretical analysis of resonator performance and acoustic-optic interaction.
  • Encapsulation of resonators in damping media to improve detection bandwidth.

Main Results:

  • Achieved noise equivalent pressures as low as 215 mPa/√Hz at 50 kHz and 41 mPa/√Hz at 800 kHz.
  • Demonstrated non-contact detection of air-coupled photoacoustic pulses from a thin Chromium film.
  • Studied the interaction of acoustic pulses with resonator mechanical modes.
  • Showcased significant improvement in detection bandwidth by using a damping medium.

Conclusions:

  • Capillary-based optical ring resonators are effective for high-sensitivity, non-contact air-coupled ultrasound detection.
  • The developed system enables compact and sensitive ultrasound detection for diverse applications.
  • This work provides a foundation for advanced photoacoustic imaging, non-destructive testing, and remote sensing.